error.c revision 155301
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#ifndef lint 34#if 0 35static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 36#endif 37#endif /* not lint */ 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: head/bin/sh/error.c 155301 2006-02-04 14:37:50Z schweikh $"); 40 41/* 42 * Errors and exceptions. 43 */ 44 45#include "shell.h" 46#include "main.h" 47#include "options.h" 48#include "output.h" 49#include "error.h" 50#include "nodes.h" /* show.h needs nodes.h */ 51#include "show.h" 52#include "trap.h" 53#include <signal.h> 54#include <stdlib.h> 55#include <unistd.h> 56#include <errno.h> 57 58 59/* 60 * Code to handle exceptions in C. 61 */ 62 63struct jmploc *handler; 64volatile sig_atomic_t exception; 65volatile sig_atomic_t suppressint; 66volatile sig_atomic_t intpending; 67char *commandname; 68 69 70static void exverror(int, const char *, va_list) __printf0like(2, 0); 71 72/* 73 * Called to raise an exception. Since C doesn't include exceptions, we 74 * just do a longjmp to the exception handler. The type of exception is 75 * stored in the global variable "exception". 76 */ 77 78void 79exraise(int e) 80{ 81 if (handler == NULL) 82 abort(); 83 exception = e; 84 longjmp(handler->loc, 1); 85} 86 87 88/* 89 * Called from trap.c when a SIGINT is received. (If the user specifies 90 * that SIGINT is to be trapped or ignored using the trap builtin, then 91 * this routine is not called.) Suppressint is nonzero when interrupts 92 * are held using the INTOFF macro. If SIGINTs are not suppressed and 93 * the shell is not a root shell, then we want to be terminated if we 94 * get here, as if we were terminated directly by a SIGINT. Arrange for 95 * this here. 96 */ 97 98void 99onint(void) 100{ 101 sigset_t sigset; 102 103 /* 104 * The !in_dotrap here is safe. The only way we can arrive here 105 * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL 106 * and killed itself. 107 */ 108 109 if (suppressint && !in_dotrap) { 110 intpending++; 111 return; 112 } 113 intpending = 0; 114 sigemptyset(&sigset); 115 sigprocmask(SIG_SETMASK, &sigset, NULL); 116 117 /* 118 * This doesn't seem to be needed, since main() emits a newline. 119 */ 120#if 0 121 if (tcgetpgrp(0) == getpid()) 122 write(STDERR_FILENO, "\n", 1); 123#endif 124 if (rootshell && iflag) 125 exraise(EXINT); 126 else { 127 signal(SIGINT, SIG_DFL); 128 kill(getpid(), SIGINT); 129 } 130} 131 132 133/* 134 * Exverror is called to raise the error exception. If the first argument 135 * is not NULL then error prints an error message using printf style 136 * formatting. It then raises the error exception. 137 */ 138static void 139exverror(int cond, const char *msg, va_list ap) 140{ 141 CLEAR_PENDING_INT; 142 INTOFF; 143 144#ifdef DEBUG 145 if (msg) 146 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 147 else 148 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 149#endif 150 if (msg) { 151 if (commandname) 152 outfmt(&errout, "%s: ", commandname); 153 doformat(&errout, msg, ap); 154 out2c('\n'); 155 } 156 flushall(); 157 exraise(cond); 158} 159 160 161void 162error(const char *msg, ...) 163{ 164 va_list ap; 165 va_start(ap, msg); 166 exverror(EXERROR, msg, ap); 167 va_end(ap); 168} 169 170 171void 172exerror(int cond, const char *msg, ...) 173{ 174 va_list ap; 175 va_start(ap, msg); 176 exverror(cond, msg, ap); 177 va_end(ap); 178} 179